NCP1086_05 datasheet(5/14 Pages) ONSEMI

Part #	NCP1086

Description	1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator

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NCP1086

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5

TCASE = 0°C

Figure 11. Ripple Rejection vs. Frequency

(Adjustable Output)

0

Output Current (A)

0.100

TCASE = 125°C

TCASE = 25°C

1.0

2.0

0.075

0.050

0.025

0

VIN − VOUT (V)

4.0

0.60

0.55

0.45

0.40

0.65

0.50

1.0

2.0

3.0

5.0

6.0

7.0

TCASE = 25°C

TCASE = 125°C

TCASE = 0°C

101

Frequency (Hz)

85

75

65

55

45

35

25

15

102

103

104

105

106

101

Frequency (Hz)

85

75

65

55

45

35

25

15

102

103

104

105

106

Figure 12. Ripple Rejection vs. Frequency

(3.3 V Fixed Output)

Figure 13. Load Regulation vs. Output Current

(Adjustable Output)

Figure 14. Minimum Load Current vs VIN − VOUT

(Adjustable Output)

TCASE = 25°C

IOUT = 6A

(VIN − VOUT = 3V)

VRIPPLE = 1.6VPP

CAdj = 0.1 mF

TCASE = 25°C

IOUT = 6A

(VIN − VOUT = 3V)

VRIPPLE = 1.6VPP

CIN = COUt = 22 mF Tantalum

APPLICATIONS INFORMATION

The

NCP1086

voltage

regulator

series

provides

adjustable and 3.3 V output voltages at currents up to 1.5 A.

The regulator is protected against overcurrent conditions

and includes thermal shutdown.

The NCP1086 series has a composite PNP−NPN output

transistor and requires an output capacitor for stability. A

detailed procedure for selecting this capacitor is included in

the Stability Considerations section.

Adjustable Operation

The adjustable output device has an output voltage range

of 1.25 V to 5.5 V. An external resistor divider sets the

output voltage as shown in Figure 15. The regulator

maintains a fixed 1.25 V (typical) reference between the

output pin and the adjust pin.

A resistor divider network R1 and R2 causes a fixed

current to flow to ground. This current creates a voltage

across R2 that adds to the 1.25 V across R1 and sets the

overall output voltage. The adjust pin current (typically

50

mA) also flows through R2 and adds a small error that

should be taken into account if precise adjustment of VOUT

is necessary.

The output voltage is set according to the formula:

VOUT + VREF

R1

) R2

R1

) IAdj

R2

The term IAdj

× R2 represents the error added by the adjust

pin current.

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